Inventor
SEKI HARUHIKO
JP5 patents
Patents
5 patentsUS11549620B2Jan 10, 2023
Screw joint for oil well pipe
JFE STEEL CORP1 citations60
US9982815B2May 29, 2018
Threaded joint for oil country tubular goods
JFE STEEL CORP1 citations51
US9709196B2Jul 18, 2017
Threaded joint for heavy-walled oil country tubular goods
JFE STEEL CORP1 citations51
US10900595B2Jan 26, 2021
Threaded joint for oil well tubing
JFE STEEL CORP0 citations50
US10125554B2Nov 13, 2018
Threaded joint for oil country tubular goods
JFE STEEL CORP0 citations40